Would love to hear if anyone’s had firsthand experience, but I have seen lots of threads before on Reddit with lots of specifics examples and Google of course will give you plenty to read up on. Tried searching here (just a couple keywords - “volume” and “semen”) but nothing super specific came up.
If you’re looking to try and build up a one-off big load, keep yourself hydrated and abstain from ejaculating for several days to a week. Seems like the general consensus from this thread was that there’s not a huge return difference between 1 week and a month or longer.
EDIT: just to add, I wouldn’t ever spend money on something that’s specifically marketed as an ejaculation enhancer or anything like that. FIrst of all, it’s probably a total scam. Second of all, even if it’s legit you could probably build the same supplement stack of vitamins and minerals that are actually helping and cut out some rubbish and cost. Just my two cents.